Hi karazy,
Why not have your main drain, backup drain, and return all inside your overflow box? I am building a similar setup next week (stand is built, tank is drilled), just need to finish the acrylic work. Going to have the return come through the side of the overflow, and into a loc-line Y with two duckbills. 3/4" pipe. I'll post pictures once its done 
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28g Nano Cube drilled with 13g sump in stock stand. Vertex IN80 Skimmer, Phosban 150 Reactor, Apex Controller, DIY LED with stock hood, dimmable
Established March 2006
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